SYMPOSIA PAPER Published: 01 January 1998
STP12346S

Effects of Wear-Resistant Coatings on the Fatigue Strength of 4340 Steel

Source

For applications using 4340 steel where hardened surfaces are required in a marine environment, surface coatings are necessary. Coatings that resist corrosion and provide wear resistance generally degrade the fatigue performance of the substrate metal. Shot peening before plating was ineffective in preventing a loss of fatigue life of plated steel bars compared to bare steel test bars which were not shot peened. The maximum residual compressive strength produced by shot peening was measured and was less than the maximum applied tensile stress in fatigue. As-plated electroless nickel has poor sliding wear resistance compared to either electroplated nickel or chromium in sliding wear at a contact stress of 37 Mpa. The tensile strength decreased in proportion to the volume fraction of coating applied to the steel substrate.

Author Information

Duffy, ER
Naval Aviation Depot North Island, San Diego, CA
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Details
Developed by Committee: E08
Pages: 133–147
DOI: 10.1520/STP12346S
ISBN-EB: 978-0-8031-5387-5
ISBN-13: 978-0-8031-2485-1